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CuriOS: Improving Reliability through Operating System
... server’s client-related state information. This allows a restarted server to continue processing requests from existing clients. Some microkernel operating systems like Chorus and Minix3 support the ability to persist state in memory through restarts; but they do not use this functionality for OS se ...
... server’s client-related state information. This allows a restarted server to continue processing requests from existing clients. Some microkernel operating systems like Chorus and Minix3 support the ability to persist state in memory through restarts; but they do not use this functionality for OS se ...
Process
... Disadvantage: Creating a user thread requires creating the corresponding kernel thread. There is an overhead related with creating kernel thread which can be burden on theDistributed performance. Univ. of Tehran ...
... Disadvantage: Creating a user thread requires creating the corresponding kernel thread. There is an overhead related with creating kernel thread which can be burden on theDistributed performance. Univ. of Tehran ...
Module 4: Processes
... Message passing may be either blocking or non-blocking Blocking is considered synchronous ...
... Message passing may be either blocking or non-blocking Blocking is considered synchronous ...
What is an operating system?
... Disadvantage: limited functionality Example: eCos, Nucleus, pSOS, VxWork, QNX, ...
... Disadvantage: limited functionality Example: eCos, Nucleus, pSOS, VxWork, QNX, ...
operating system design
... Since multiple users can be logged into a computer at the same time, the operating system needs to provide mechanisms to keep them separated. One user may not interfere with another. The process concept is widely used to group resources together for protection purposes. Files and other data structur ...
... Since multiple users can be logged into a computer at the same time, the operating system needs to provide mechanisms to keep them separated. One user may not interfere with another. The process concept is widely used to group resources together for protection purposes. Files and other data structur ...
Module 6: CPU Scheduling - University of South Florida
... 1. t n actual length of n th CPU burst 2. n 1 predicted value for the next CPU burst ...
... 1. t n actual length of n th CPU burst 2. n 1 predicted value for the next CPU burst ...
Threads
... Linux refers to them as tasks rather than threads Thread creation is done through clone() system call clone() allows a child task to share the address space ...
... Linux refers to them as tasks rather than threads Thread creation is done through clone() system call clone() allows a child task to share the address space ...
2_threads
... Processes send messages through an IPC facility Transfer information without shared variables Works over a network Harder to implement Maybe more overhead Less concurrency problems – Why?? ...
... Processes send messages through an IPC facility Transfer information without shared variables Works over a network Harder to implement Maybe more overhead Less concurrency problems – Why?? ...
Virtualization
... • Xen is a free open source solution for operating system-level paravirtualization from XenSource. Recall that in paravirtualization the hypervisor and the operating system collaborate on the virtualization, requiring operating system changes but resulting in near native performance. • As Xen requir ...
... • Xen is a free open source solution for operating system-level paravirtualization from XenSource. Recall that in paravirtualization the hypervisor and the operating system collaborate on the virtualization, requiring operating system changes but resulting in near native performance. • As Xen requir ...
Arrakis: The Operating System is the Control Plane
... In Arrakis, we use SR-IOV, the IOMMU, and supporting adapters to provide direct application-level access to I/O devices. This is a modern implementation of an idea which was implemented twenty years ago with U-Net [54], but generalized to flash storage and Ethernet network adapters. To make user-lev ...
... In Arrakis, we use SR-IOV, the IOMMU, and supporting adapters to provide direct application-level access to I/O devices. This is a modern implementation of an idea which was implemented twenty years ago with U-Net [54], but generalized to flash storage and Ethernet network adapters. To make user-lev ...
Definition of Operating System
... The users of batch operating system do not interact with the computer directly. Each user prepares his job on an off-line device like punch cards and submits it to the computer operator. To speed up processing, jobs with similar needs are batched together and run as a group. Thus, the programmers le ...
... The users of batch operating system do not interact with the computer directly. Each user prepares his job on an off-line device like punch cards and submits it to the computer operator. To speed up processing, jobs with similar needs are batched together and run as a group. Thus, the programmers le ...
[ppt
... overlooking a few of these issues. The solution adopted was to canonicalize in the kernel after copying the filenames. ...
... overlooking a few of these issues. The solution adopted was to canonicalize in the kernel after copying the filenames. ...
Chapter 13: I/O Systems
... User process may accidentally or purposefully attempt to disrupt normal ...
... User process may accidentally or purposefully attempt to disrupt normal ...
Operating Systems II
... Hardware Support for Operating Systems Recall that OS should securely multiplex resources. ⇒ we need to ensure that an application cannot: • compromise the operating system. • compromise other applications. • deny others service (e.g. abuse resources) To achieve this efficiently and flexibly, we ne ...
... Hardware Support for Operating Systems Recall that OS should securely multiplex resources. ⇒ we need to ensure that an application cannot: • compromise the operating system. • compromise other applications. • deny others service (e.g. abuse resources) To achieve this efficiently and flexibly, we ne ...
Chapter 6: Process/thread Synchronization
... ■ Background" ■ The Critical-Section Problem" ■ Peterson’s Solution" ■ Synchronization Hardware" ■ Semaphores" ■ Classic Problems of Synchronization" ■ Monitors" ■ Synchronization Examples " ■ Atomic Transactions" ...
... ■ Background" ■ The Critical-Section Problem" ■ Peterson’s Solution" ■ Synchronization Hardware" ■ Semaphores" ■ Classic Problems of Synchronization" ■ Monitors" ■ Synchronization Examples " ■ Atomic Transactions" ...
Lessons Learned from 30 Years of MINIX,
... system components, including the file system and memory manager, was compiled as a separate program and run as a separate process. Because the 8088 did not have a memory management unit (MMU), I could have taken shortcuts and put everything into one executable but decided against it because I wanted ...
... system components, including the file system and memory manager, was compiled as a separate program and run as a separate process. Because the 8088 did not have a memory management unit (MMU), I could have taken shortcuts and put everything into one executable but decided against it because I wanted ...
Java Threads
... Linux refers to them as tasks rather than threads Thread creation is done through clone() system call clone() allows a child task to share the address space ...
... Linux refers to them as tasks rather than threads Thread creation is done through clone() system call clone() allows a child task to share the address space ...
Operating Systems, 082
... Next, the shell uses fork() to create a process (same user ID) Now, it takes the executable name grep and the arguments, all from argv, and uses execvp() (or a similar system call) to run the grep executable On foreground execution, the shell would use the wait() system call and continue its s ...
... Next, the shell uses fork() to create a process (same user ID) Now, it takes the executable name grep and the arguments, all from argv, and uses execvp() (or a similar system call) to run the grep executable On foreground execution, the shell would use the wait() system call and continue its s ...
Chapter 13: I/O Systems
... Explore the structure of an operating system’s I/O subsystem Discuss the principles of I/O hardware and its complexity Provide details of the performance aspects of I/O hardware ...
... Explore the structure of an operating system’s I/O subsystem Discuss the principles of I/O hardware and its complexity Provide details of the performance aspects of I/O hardware ...